摘要
分析了昆明市1961~2006年日照时数变化特征及与日照百分率、总云量、低云量、水汽压和地面定时能见度之间的关系。结果表明：日照时数呈减少趋势,日照时数的减少幅度为115 h/10 a,其中又以春、夏季减少最快。年日照时数存在突变现象,突变点在1980年。日照百分率与日照时数变化趋势相一致。年低云量、总云量、水汽压略呈增加趋势,总云量和水汽压与日照时数变化呈显著的负相关,是昆明市日照时数减少的主要因素。地面能见度呈下降趋势,表明大气气溶胶含量上升,影响日照时数变化,但不是主要因素。
The variation characteristics of sunshinehours and the relation between sunshine hours and relative sunshine, total cloudiness, lower cloudines, water vapor pressure and visibility from 1961 to 2006 in Kunming City are analyzed. The results show： sunshine hours has greatly decreased in the recent 46 years, with the breadth of 115 h/10 a and decreased fastest in spring and summer. The mutation of sunshine hours occurred in1980. Relative sunshine and sunshine hours are in line with changing trends. Lower cloudines, total cloudiness and water vapor pressure are slightly increasing trend. The significantly negative correlation exits between sunshine hours and total cloud cover, water vapor pressure which are the major factors that make sunshine hours reduce. Visibility drop, which show that increases in atmospheric aerosols and effect sunshine hours.
出处
《云南地理环境研究》
2009年第4期101-105,共5页
Yunnan Geographic Environment Research
关键词
昆明市
日照变化
特征分析
Kunming
sunshine variation
characteristics analys
